masqmail

view src/mservdetect.c @ 281:ea5f86e0a81c

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modes are now enforced exclusive Other MTAs (exim, postfix) are more relaxing, but as combinations of exclusive modes are senseless we behave more obvious if we fail early. This makes understanding the behavior easier too.
author markus schnalke <meillo@marmaro.de>
date Tue, 07 Dec 2010 14:04:56 -0300
parents bd7c52a36b0c
children 41958685480d
line source
1 /* MasqMail
2 Copyright (C) 1999-2001 Oliver Kurth
3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20
21 #include "masqmail.h"
22 #include "readsock.h"
23
24
25 gboolean
26 init_sockaddr2(struct sockaddr_in * name, gchar* addr, int port)
27 {
28 struct hostent *he;
29 struct in_addr ia;
30
31 if (inet_aton(addr, &ia) != 0) {
32 /* IP address */
33 memcpy(&(name->sin_addr), &ia, sizeof(name->sin_addr));
34 } else {
35 if ((he = gethostbyname(addr)) == NULL) {
36 fprintf(stderr, "local address '%s' unknown. (deleting)\n", addr);
37 return FALSE;
38 }
39 memcpy(&(name->sin_addr), he->h_addr, sizeof(name->sin_addr));
40 }
41 name->sin_family = AF_INET;
42 name->sin_port = htons(port);
43
44 return TRUE;
45 }
46
47
48 gchar*
49 mserver_detect_online(gchar* addr, int port)
50 {
51 struct sockaddr_in saddr;
52 gchar *ret = NULL;
53
54 if (!init_sockaddr2(&saddr, addr, port)) {
55 return NULL;
56 }
57
58 int sock = socket(PF_INET, SOCK_STREAM, 0);
59 int dup_sock;
60 if (connect(sock, (struct sockaddr *) (&saddr), sizeof(saddr)) != 0) {
61 return NULL;
62 }
63
64 FILE *in, *out;
65 char buf[256];
66
67 dup_sock = dup(sock);
68 out = fdopen(sock, "w");
69 in = fdopen(dup_sock, "r");
70
71 if (!read_sockline(in, buf, 256, 15, READSOCKL_CHUG)) {
72 return NULL;
73 }
74
75 /* this is the protocol (reverse engineered):
76
77 S: READY
78 C: STAT
79 |
80 +----------------+-----------------+
81 | | |
82 S: DOWN S: UP foo:-1 S: UP foo:1
83 C: QUIT C: QUIT C: QUIT
84
85 -> offline -> offline -> online
86 `foo' gets printed
87
88 */
89
90 if (strncmp(buf, "READY", 5) == 0) {
91 fprintf(out, "STAT\n");
92 fflush(out);
93 if (read_sockline(in, buf, 256, 15, READSOCKL_CHUG)) {
94 if (strncmp(buf, "DOWN", 4) == 0) {
95 ret = NULL;
96 } else if (strncmp(buf, "UP", 2) == 0) {
97 gchar *p = buf + 3;
98 while ((*p != ':') && *p) {
99 p++;
100 }
101 if (*p) {
102 *p = '\0';
103 p++;
104 if ((atoi(p) >= 0) && *p) {
105 /* `UP foo:N', where `N' is a non-negative number */
106 ret = g_strdup(buf + 3);
107 }
108 } else {
109 fprintf(stderr, "unexpected response from mserver after STAT cmd: %s", buf);
110 }
111 } else {
112 fprintf(stderr, "unexpected response from mserver after STAT cmd: %s", buf);
113 }
114 }
115 }
116 fprintf(out, "QUIT");
117 fflush(out);
118
119 close(sock);
120 close(dup_sock);
121 fclose(in);
122 fclose(out);
123
124 return ret;
125 }
126
127
128 int
129 main(int argc, char *argv[])
130 {
131 gchar* addr;
132 int port;
133 gchar *name;
134
135 if (argc != 3) {
136 fprintf(stderr, "usage: %s HOST PORT\n", argv[0]);
137 return 1;
138 }
139
140 addr = argv[1];
141 port = atoi(argv[2]);
142
143 name = mserver_detect_online(addr, port);
144
145 if (name) {
146 printf("%s\n", name);
147 return 0;
148 }
149 return 1;
150 }